Remove /proc/cpuinfo parsing

- Clean up the paths for ro.revision and ro.hardware parsing
- Use ro.hardwre in ueventd instead of parsing the kernel command line

(cherry-pick of 38b340a52f8e864650db8bae1eb88d5c00485db0.)

Bug: 19366018
Change-Id: I018a293f3d46e736a8b65132b5b00b0f7c20edae
4 files changed